JP3837433B2 - Extrusion head - Google Patents

Description

  The present invention relates to an extrusion head connected to a rubber or resin extruder, and more particularly to an extrusion head that can be easily and securely fastened by assembling a plurality of divided heads and can be downsized. .

  The extrusion head connected to the rubber or resin extrusion machine is divided along the flow path of the extrudate and has a structure that can be opened and closed so that the extrudate material in the flow path can be removed, cleaned and maintained. There are many. When extruding, it is necessary to assemble the divided heads against the extruding pressure of the extrudate and securely fasten the extrudates between the heads, that is, from the mating surfaces.

  With respect to this fastening means, in the conventional split-type extrusion head, the rod shaft extends after the hammer-like tip portion of the cylinder rod extending from the fixed head side passes through the clearance of the through-hole-shaped recess provided in the movable head. A structure that rotates 90 degrees around the center and is hooked in the recess on the upper end surface of the through-hole, and then moves in the direction in which the cylinder rod contracts, thereby pressing the movable head against the fixed head and fastening it Has been proposed (see Patent Document 1).

  In this proposal, in addition to the cylinder rod advance / retreat mechanism, there is a problem that a rotation mechanism for rotating the rod is required and the structure becomes complicated.

In addition, a large compressive stress acts on the contact portion between the hammer-shaped tip and the recess end surface during fastening, but if the hammer-shaped tip is small, the contact area becomes small and the contact portion tends to be deformed, so that strong fastening is achieved. There was a problem that it was difficult. In addition, if the hammer-shaped tip is enlarged to suppress deformation, it is necessary to allow sufficient space so that it does not interfere with other parts when the hammer-shaped tip moves. There was a problem of becoming.
Japanese Patent No. 2609261

  An object of the present invention is to provide an extrusion head that can be easily and securely fastened by assembling a plurality of divided heads and can be downsized.

In order to achieve the above object, an extrusion head according to the present invention is divided into a fixed head and a movable head rotatably supported by the fixed head along an extrusion flow path from the extruder so as to be opened and closed. The engaging means is provided with a tip locking portion at the tip of the operating rod, and an engaging portion is provided on the movable head, and the leading end locking portion is locked to the engaging portion by advancing and retracting the operating rod. In the extrusion head configured to assemble and fasten the movable head to the fixed head, a penetrating portion that allows the tip engaging portion to be inserted is provided in the engaging portion, and the tip after protruding through the penetrating portion is provided. A stopper capable of entering and leaving is provided in a gap formed between the engaging part and the engaging part, and the stopper is made enterable and detachable by the operation of a cylinder rod of a fluid cylinder. The so inserted is characterized in that said tip engaging portion to allow engagement with the engaging portion.
Further, another extrusion head according to the present invention is divided into a fixed head and a movable head rotatably supported by the fixed head along an extrusion flow path from the extruder so as to be openable and closable. A front end locking portion is provided at the front end of the operating rod of the fastening means, and an engaging portion is provided in the movable head, and the front end locking portion is locked to the engaging portion by advancing and retreating operation of the operating rod. In the extrusion head in which the movable head is assembled and fastened to the fixed head, a stopper capable of entering and leaving is inserted between the tip locking portion and the engagement portion, and the tip locking portion is engaged with the engagement head. The engaging portion can be locked, a rear end locking portion is provided at the rear end of the operating rod, and the operating rod is supported by a jack fixing block fixed to the fixed head so as to be movable toward the movable head, jack A jack is inserted between the fixed block and the rear end locking portion, and the leading end locking portion can be locked to the locking portion by inserting the stopper by the operation of the operation rod by expansion and contraction of the jack. It is characterized by that.

According to the present invention, the tip locking portion at the tip of the actuating rod that can be moved back and forth from the fixed head side to the movable head side is inserted into the penetrating portion of the engaging portion provided in the movable head, and the tip locking portion after protruding. since parts and so inserted stopper in the gap formed between the engaging portion engaged a tip engaging portion and the engaging portion, with a simple structure, the head each other are brought into close contact with the mating surface of each other Can be concluded. Since actuating rod only linearly reciprocating, can be reduced in size requires also small space required for operation.

  In addition, since the area of the tip locking portion and the stopper that bears the fastening force generated by the fastening can be easily increased, the stress can be reduced even for a large fastening force, and reliable fastening is possible. This can prevent the extrudate from leaking from the mating surfaces of both heads.

  Hereinafter, the extrusion head of the present invention will be described based on the embodiments shown in the drawings. In the embodiment shown in FIGS. 3 and 4, the extrusion head 1 of the present invention is formed with an extrusion flow path 15 through which the extrudate extruded from the extruder 17 flows to a die 16 attached to the front surface. The extrusion head 1 includes a movable head 2 and a fixed head 3 that are divided along the extrusion flow path 15. The fixed head 3 is connected and fixed to two extruders 17 and 17 through a flange portion. The movable head 2 is composed of an upper head 2 a and a middle head 2 b which are divided along another extrusion flow path 15.

  5 and 6 show the relationship between the movable head 2 and the fixed head 3 constituting the extrusion head 1 with some components omitted.

  FIG. 5 shows the time when the movable head 2 is tightened to the fixed head 3 side to close the two extrusion flow paths 15, and FIG. 6 shows the time when the open head is opened. The upper head 2 a and the middle head 2 b which are the movable heads 2 are rotatably supported by the support shaft 4 in the vicinity of the upper corner portion of the fixed head 3. As shown in FIG. 5, when the upper head opening / closing cylinder rod 6a extends, the upper head opening / closing fluid cylinder 5a rotates around the support shaft 4 toward the fixed head 3 so that the mating surface PL is set to the middle head 2b. The extrusion flow path 15 is closed with close contact. Further, as shown in FIG. 6, the upper head opening / closing cylinder rod 6a is contracted to rotate the support shaft 4 around the support head 4 side, so that the mating surface PL is separated from the middle head 2b. Then, the extrusion flow path 15 is opened.

  Similarly, the intermediate head 2b is rotated about the support shaft 4 by the advance / retreat of the intermediate head opening / closing cylinder rod 6b, and the mating surface PL is brought into close contact with and separated from the fixed head 3 to close the extrusion flow path 15. State, open. As the opening / closing fluid cylinder 5, a hydraulic cylinder or an air cylinder can be used.

  On both side surfaces of the upper head 2a, there are provided engaging portions 7 provided with through holes 8 penetrating from the fixed head 3 side toward the upper head 2a side. As shown in FIGS. 1 and 2, the engaging portion 7 is provided with a U-shaped stopper 9 that can move back and forth on its upper surface, and can move on the end surface of the through hole 8. In FIG. 1, a structure in which the upper head 2a and the middle head 2b are integrated is shown as a movable head 2, and the structure is simplified.

  The U-shaped stopper 9 is attached to the tip of the stopper cylinder rod 11 of the stopper fluid cylinder 10, and the stopper cylinder rod 11 advances and retreats so that the upper surface of the engaging portion 7 is over the through hole 8. Moving. As the stopper fluid cylinder 10, a hydraulic cylinder or an air cylinder can be used.

  On the other hand, a fastening cylinder 12 is provided on both side surfaces of the fixed head 3, and the fastening cylinder rod 13 has a cylindrical tip locking portion 14 a having a diameter larger than the shaft diameter of the rod 13 at the tip. Yes. The fastening cylinder rod 13 moves up and down in the through hole 8 of the engaging portion 7 provided in the movable head 2 so that the tip locking portion 14 a protrudes from the upper surface of the engaging portion 7. As the fastening cylinder 12, a hydraulic cylinder or an air cylinder can be used.

  As described above, the U-shaped stopper 9 enters the lower side or retracts when the front end locking part 14a protrudes upward with respect to the front end locking part 14a protruding from the upper surface of the engaging part 7. It becomes possible to engage and disengage. The shape of the stopper 9 is a shape that can be inserted into the gap between the engaging portion 7 and the leading end locking portion 14 a that protrudes through the through-hole 8 and can lock the leading end locking portion 14 a to the engaging portion 7. Good. In particular, it is preferable to have a cutout portion that engages with the fastening cylinder rod 13 and surrounds the fastening cylinder rod 13. By this notch, the front end locking portion 14a can be reliably and stably locked to the engaging portion 7.

  On the other hand, the distal end locking portion 14 a is not limited to a cylindrical shape, and may be any shape that protrudes from the through hole 8 and can insert the stopper 9 between the engaging portion 7. For example, the fastening cylinder rod 13 having a convex portion or a concave portion in the axial radial direction is used. The through-hole 8 is formed in a shape slightly larger than the shape of the tip locking portion 14a so that the tip locking portion 14a can be inserted therethrough.

  When the movable head 2 and the fixed head 3 are assembled and fastened for extrusion, the opening / closing cylinder rod 6 is extended and the movable head 2 is closed so as to be assembled to the fixed head 3 as shown in FIG. . Thereafter, as shown in FIG. 1, the fastening cylinder rod 13 of the fastening hydraulic cylinder 12 is extended so that the distal end locking portion 14a is inserted through the through hole 8 of the engaging portion 7 and is engaged with the bottom surface of the distal end locking portion 14a. The protrusions are projected until the distance from the upper surface of the joint portion 7 is equal to or greater than the thickness of the U-shaped stopper 9. Thereafter, as shown in FIG. 2, the stopper cylinder rod 11 of the stopper cylinder 10 is extended so that the notch portion of the U-shaped stopper 9 is engaged with the fastening cylinder rod 13 interposed therebetween, and the tip locking portion A U-shaped stopper 9 is inserted between the bottom surface of 14 a and the upper surface of the engaging portion 7.

  In this state, when the fastening cylinder rod 13 is retracted in the contracting direction, the tip locking portion 14a is locked to the engaging portion 7, and the movable head 2 is moved via the tip locking portion 14a and the U-shaped stopper 9. Pressed by the fixed head 3. By this pressing, the movable head 2 and the fixed head 3 can be securely and firmly fastened by being brought into close contact with the mating surface PL of the movable head 2 and the fixed head 3 so as to resist the extrusion pressure.

  This fastening means uses a fastening cylinder rod 13 that linearly advances and retracts from the fixed head 3 to the movable head 2 side as an operating rod, and linearly advances and retracts in a direction intersecting the extension line of the fastening cylinder rod 13. The stopper cylinder rod 11 has a simple configuration. Therefore, since the space required for the operation can be small, the extrusion head 1 can be miniaturized and can be manufactured at low cost. Fastening is easy, and it is difficult for troubles to occur.

  In addition, since it is easy to increase the area of the tip locking portion 14a that bears the tightening force generated by the fastening and the U-shaped stopper 9, the contact area is increased for a large fastening force. Thus, the stress can be reduced and the mating surface PL between the movable head 2 and the fixed head 3 can be brought into close contact with each other, so that the generation of gaps can be suppressed. For example, in a rubber extruder, the extrusion pressure may be 25 MPa, which is a structure suitable for resisting such a large pressure. When the fastening force is small, the tip locking portion 14a and the U-shaped stopper 9 can be made small to reduce the contact area thereof, and the entire fastening means and thus the entire extrusion head 1 can be miniaturized.

  Further, it is the fastening cylinder rod 13 that bears the tensile force due to the fastening force. To reduce the tensile stress in this portion, it can be easily dealt with by increasing the rod diameter.

    On the other hand, in order to release the fastening and open the movable head 2 with respect to the fixed head 3, a procedure opposite to the fastening procedure described above may be performed. Accordingly, the fastening can be easily and reliably released, and the extrusion flow path 15 can be easily cleaned and maintained.

  In the case where the fastening force becomes very large, stoppers 9a and 9b as shown in FIGS. 7 and 8 may be used instead of the stopper 9 shown in FIGS. FIG. 7 is a side view in which the periphery of the engaging portion 7 is partially seen through, and FIG. 8 is a plan view taken in the direction of arrow B in FIG. Both stoppers 9a and 9b are U-shaped, and the stopper cylinder rods 11 and 11 connected to each other move forward and backward to move the upper surface of the engaging portion 7 back and forth, so that the notches of the stoppers 9a and 9b are cut out. Are in contact with each other.

  When the movable head 2 and the fixed head 3 are fastened, the stoppers 9a and 9b are separated from each other and placed at positions shifted from above the through hole 8 of the engaging portion 7. Next, when the fastening cylinder rod 13 is extended and the distal end locking portion 14a protrudes above the engaging portion 7, one stopper 9a is advanced by extending the stopper cylinder rod 11, and the other stopper 9b is moved to the stopper. The cylinder rod 11 is retracted by contracting.

  As a result, both stoppers 9a and 9b are inserted between the distal end locking portion 14a and the engaging portion 7, and through holes are formed in the respective notches to surround the fastening cylinder rod 13. When the fastening cylinder rod 13 is contracted in this state, the tip locking portion 14a is locked, and the movable head 2 and the fixed head 3 are brought into close contact and fastened.

  As described above, by using the stoppers 9a and 9b, the contact area between the stoppers 9a and 9b and the tip locking portion 14a can be maximized without waste. Therefore, even when a large fastening force acts, it is possible to make the movable head 2 and the fixed head 3 in close contact with each other by reducing the stress at the contact portion.

  Moreover, in order to fasten the movable head 2 and the fixed head 3, fastening means as shown in FIGS. 9 and 10 can be used. FIG. 9 is a side view showing a state in which the movable head 2 and the fixed head 3 are fastened and the extrusion flow path 15 (not shown) is closed, and FIG. 10 is a side view showing the open state. In both figures, some of the components are omitted.

  In this fastening means, instead of the fastening cylinder rod 13 shown in FIG. 7 as an operating rod, a fastening member having a cylindrical front end locking portion 14a and a rear end locking portion 14b having enlarged diameters at the front end and the rear end, respectively. A rod 13 is used. As shown in FIG. 9, the fastening rod 13 is inserted through the through hole 8 of the engaging portion 7 provided in the movable head 2 to project the tip locking portion 14 a. Further, the through hole 3b of the jack fixing block 3a which is fixed to the fixed head 3 so as to protrude to the position closer to the movable head 2 than the rear end locking portion 14b is inserted, and the through hole 19a of the flange-shaped clamp block 19 is inserted. The clamp block 19 and the rear end locking portion 14b are brought into contact with each other.

  An advancing / retracting fluid cylinder 20 having one end connected to the jack fixing block 3a and the other end connected to the rear end locking portion 14b is attached, and the rear end locking portion 14b and the jack fixing block are interposed with a clamp block 19 interposed therebetween. Two jacks 18 are provided on both sides of the fastening rod 13 between 3a and 3a.

  When fastening with this fastening means, both stoppers 9a and 9b are inserted between the tip locking portion 14a and the engaging portion 7 in the same manner as the procedure described in FIG. Next, as shown in FIG. 9, by extending the jack 18, the rear end locking portion 14b is pressed, and the front end locking portion 14a is retracted from the movable head 2 side to the fixed head 3 side. As a result, the movable head 2 rotates about the support shaft 4 and is fastened so that the fixed head 3 and the mating surface PL are in close contact with each other.

  On the other hand, when releasing this fastening, the jack 18 is contracted and both stoppers 9a and 9b are moved to release the locking with the tip locking portion 14a. Next, as shown in FIG. 10, the advancing / retreating fluid cylinder rod 21 of the advancing / retreating fluid cylinder 20 is extended, and the fastening rod 13 is retracted toward the fixed head 3. When the movable head 2 is rotated around the support shaft 4 by using an opening / closing fluid cylinder 5 (not shown), the movable head 2 is opened with respect to the fixed head 3. The clamp block 19 can be omitted.

  As described above, since the fastening force is generated by the jack 18 in this fastening means, the fastening hydraulic cylinder 12 that needs to be enlarged when a large fastening force is required can be eliminated. Further, since the advancing / retreating fluid cylinder 20 merely advances and retracts the fastening rod 13, it is not necessary to generate a large force, and the size and cost can be reduced. As the jack 18, a hydraulic jack, a mechanical jack, or the like can be used, and the number to be installed is not limited to that shown in the embodiment.

  In the present invention, the number of movable heads 2 and the number of extruders 17 connected to the fixed head 3 are not limited to the numbers shown in the above embodiment.

It is a partial see-through | perspective side view which shows the engaging part periphery of this invention. It is an A arrow top view of FIG. It is a front view which shows an example of the extrusion head of this invention. FIG. 4 is a partially transparent side view of FIG. 3. It is a partially omitted side view showing a state in which the movable head constituting the extrusion head of the present invention rotates to the fixed head side and closes the extrusion flow path. It is a partially omitted side view showing a state in which the movable head constituting the extrusion head of the present invention rotates in the direction opposite to the fixed head side to open the extrusion flow path. FIG. 6 is a partially transparent side view illustrating the periphery of an engaging portion using another stopper as another embodiment of the extrusion head of the present invention. FIG. 8 is a plan view from the direction of arrow B in FIG. 7. FIG. 10 is a partially omitted side view showing a state in which the movable head and the fixed head are brought into close contact with each other by fastening another fastening means as still another embodiment of the extrusion head of the present invention. FIG. 10 is a partially omitted side view showing a state where the fastening of the fastening means of FIG. 9 is released and the movable head and the fixed head are separated from each other.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Extrusion head 2 Movable head 2a Upper head (movable head) 2b Middle head (movable head)
DESCRIPTION OF SYMBOLS 3 Fixed head 3a Jack fixed block 3b Through-hole 4 Support shaft 5 Opening / closing fluid cylinder 5a Upper head opening / closing fluid cylinder 5b Middle head opening / closing fluid cylinder 6 Opening / closing cylinder rod 6a Upper head opening / closing cylinder rod 6b Middle head opening / closing cylinder Rod 7 Engaging portion 8 Through-hole 9, 9a, 9b Stopper 10 Stopper fluid cylinder 11 Stopper cylinder rod 12 Fastening hydraulic cylinder 13 Fastening cylinder rod (fastening rod)
14a Front end locking part 14b Rear end locking part 15 Extrusion flow path 16 Die 17 Extruder 18 Jack 19 Clamp block 19a Through hole 20 Fluid cylinder for advance / retreat 21 Fluid cylinder rod for advance / retreat

Claims (6)

A fixed head and a movable head rotatably supported by the fixed head are split along the extrusion flow path from the extruder so as to be openable and closable. A stop portion is provided, an engagement portion is provided on the movable head, and the distal end locking portion is locked on the engagement portion by the advance / retreat operation of the operating rod, and the movable head is assembled and fastened to the fixed head. In the extrusion head,
The engaging portion is provided with a penetrating portion that allows the leading end locking portion to be inserted, and enters and leaves the gap formed between the leading end locking portion and the engaging portion after protruding through the penetrating portion. Extrusion in which a stopper is provided, the stopper can be moved into and out of the gap by operation of a cylinder rod of a fluid cylinder, and the stopper can be inserted to lock the tip locking portion to the engaging portion. head. Extrusion head according to claim 1 wherein the actuating rod is a cylinder rod of the fluid body cylinder provided on said fixed head. A fixed head and a movable head rotatably supported by the fixed head are split along the extrusion flow path from the extruder so as to be openable and closable. A stop portion is provided, an engagement portion is provided on the movable head, and the distal end locking portion is locked on the engagement portion by the advance / retreat operation of the operating rod, and the movable head is assembled and fastened to the fixed head. In the extrusion head,
A stopper capable of entering and leaving is inserted between the front end locking portion and the engaging portion, so that the front end locking portion can be locked to the engaging portion, and a rear end is provided at the rear end of the operating rod. A locking portion is provided, and the operating rod is supported by a jack fixing block fixed to the fixed head so as to be movable toward the movable head, and a jack is interposed between the jack fixing block and the rear end locking portion. An extrusion head which is inserted and can be locked to the locking part by inserting the stopper through the stopper by the operation of the operation rod by expansion and contraction of the jack. The stopper is provided with a penetrating part that allows the tip engaging part to be inserted therethrough, and the stopper is formed between the tip engaging part and the engaging part after protruding through the penetrating part. The extrusion head according to claim 3, which is provided so as to be able to enter and leave . The extrusion head according to claim 3 or 4, wherein the rear end locking portion is connected to the jack fixing block by a fluid cylinder, and the operation rod is moved forward and backward by operation of the fluid cylinder . The extrusion head according to any one of claims 1 to 5, wherein the stopper has a notch for locking the tip locking portion .

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